avoid addEventListener in Polymer
avoid addEventListener in Polymer

workaround for: https://code.google.com/p/dart/issues/detail?id=17406
...to prevent silent failures when dirty checking doesn't happen

R=sigmund@google.com

Review URL: https://codereview.chromium.org//347463002

git-svn-id: 0aa7e0b98478d6ef7145d04e8154f8ab2209deba@37432 260f80e4-7a28-3924-810f-c04153c831b5

meflyup/polymer-dart,jakemac53/polymer-dart,dart-archive/polymer-dart,dart-archive/polymer-dart,ronlobo/polymer-dart,ronlobo/polymer-dart,meflyup/polymer-dart,dam0vm3nt/polymer-dart,dam0vm3nt/polymer-dart,jakemac53/polymer-dart